Martin Logan Grotto I Subwoofer

The world's most affordable servo-controlled subwoofer, Grotto i proves that a precise, compact subwoofer can have the heart of a beast.
A powerful 300 watt (900 watt peak) low-distortion, high-reliability amplifier gives Grotto i extremely articulate bass without need of exaggerated amplifier power ratings or transient-blurring ported or passive radiator enclosures common to many modern subwoofers. A proprietary servo system further ensures that output from Grotto i's 10-inch high-resolution aluminum cone woofer is dramatically free of distortion and provides a faithful replica of the audio input signal.

Frequency Response: 22–120 Hz ±3dB; Anechoic through LFE effects input
Impedance: Line level RCA: 20,000 Ohms. Compatible with 4, 6, or 8 Ohm rated amplifiers.
Low Frequency Transducer: 10" (25.4cm) high excursion, aluminum cone with extended throw drive assembly, sealed non-resonant asymmetrical chamber format
Amplifier: 300W (at less than 0.5% THD) 900W (peak)
Audio Controls: ±10dB at 25Hz
High Pass Filter Frequency: 70Hz
Low Pass Filter Frequency: 30, 35, 45, 55, 65, 80Hz
Inputs: Left/Right RCA Line Level, RCA LFE, Speaker Level
Power Draw: Max: 250 Watts Idle: 15 Watts Standby: 10 Watts
Weight: 51 lbs. (23.2 kg)
Dimensions: 18.6" × 15.2" × 13.8" (47.3cm × 38.6cm × 35cm)

Turnaround

Orders will usually dispatched within 2 working days of receiving cleared payment.

Shipping Rates

We calculate your shipping rate based on the total weight of your items and your delivery address. Standard shipping to the UK Mainland (excludes Northern Ireland, Isle of Man, Channel Islands) is free, except where specifically indicated. Don't worry, you'll always see the final shipping charge displayed before you reach the payment step (on the checkout page).

Carriers

We despatch the bulk of our UK mainland items on a 24 hour service.  Non-Mainland locations – Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer. Smaller items are delivered using Royal Mail 24 or special delivery. Larger items are delivered using a courier service such as UPS and occasionally by a Pallet service.

Order Tracking

If a tracking # is provided by the carrier, we will update your order with the tracking information. Please note that some orders will not have tracking numbers.